Class CMemPagePool

class CMemPagePool : public CBase, public MPagePool;

Description

Uses memory to implement the MPagePool page pool interface.

The class allocates pages from the default heap, storing them in an array. This pool is not persistent.

Derivation

• MPagePool - Interface to a page pool, the storage abstraction used by the B-trees API
• CBase - Base class for all classes to be instantiated on the heap

• CMemPagePool - Uses memory to implement the MPagePool page pool interface

Members

Defined in CMemPagePool:
AcquireL(), AllocL(), AssignL(), CMemPagePool(), DoDeleteL(), LockL(), NewL(), NewLC(), Unlock(), UpdateL(), ~CMemPagePool()

Inherited from CBase:
Delete(), Extension_(), operator new()

Inherited from MPagePool:
DeleteL(), Pop(), PushL()

static IMPORT_C CMemPagePool *NewL();

Description

Allocates and constructs a new CMemPagePool object.

Return value

CMemPagePool * New CMemPagePool object

static IMPORT_C CMemPagePool *NewLC();

Description

Allocates and constructs a new CMemPagePool object, and leaves it on the cleanup stack.

Return value

CMemPagePool * New CMemPagePool object

IMPORT_C CMemPagePool();

Description

Default constructor.

IMPORT_C ~CMemPagePool();

Description

Destructor.

On destruction, memory for all pages is freed.

virtual IMPORT_C TPageAbandonFunction AcquireL();

Description

For memory-based pools, there is no need to abandon pages, so the function returned does nothing.

Return value

TPageAbandonFunction Function that does nothing.

virtual IMPORT_C TAny *AllocL();

Description

Allocates a new unassigned page.

Return value

TAny * Newly allocated page.

virtual IMPORT_C TAny *LockL(TPageRef aRef);

Description

Returns a pointer to a specified page.

Parameters

TPageRef aRef Reference to the page to get

Return value

TAny * Page specified by aRef

virtual IMPORT_C TPageRef AssignL(const TAny *aPage, TPageReclamation aReclamation=EPageDeleteOnly);

Description

Parameters

const TAny *aPage TPageReclamation aReclamation

Return value

TPageRef

virtual IMPORT_C void UpdateL(const TAny *aPage);

Description

Updates a page.

This can be used for cached pages that may have become outdated.

Parameters

const TAny *aPage Page to update

virtual IMPORT_C void Unlock(const TAny *aPage, TPageChange aChange=EPageNoChange);

Description

Unlocks a page.

Parameters

const TAny *aPage Page to unlock TPageChange aChange How the page should be treated once it is unlocked

protected: virtual IMPORT_C void DoDeleteL(TPageRef aRef);

Description

Parameters

TPageRef aRef